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<body>
<div class="document" id="ctags">
<span id="ctags-incompatibilities-7"></span>
<h1 class="title">ctags</h1>
<h2 class="subtitle" id="incompatibilities-between-universal-ctags-and-exuberant-ctags">Incompatibilities between Universal-ctags and Exuberant-ctags</h2>
<table class="docinfo" frame="void" rules="none">
<col class="docinfo-name" />
<col class="docinfo-content" />
<tbody valign="top">
<tr><th class="docinfo-name">Version:</th>
<td>0.0.0</td></tr>
<tr class="manual-group field"><th class="docinfo-name">Manual group:</th><td class="field-body">Universal-ctags</td>
</tr>
<tr class="manual-section field"><th class="docinfo-name">Manual section:</th><td class="field-body">7</td>
</tr>
</tbody>
</table>
<div class="section" id="synopsis">
<h1>SYNOPSIS</h1>
<div class="line-block">
<div class="line"><strong>ctags</strong> [options] [file(s)]</div>
<div class="line"><strong>etags</strong> [options] [file(s)]</div>
</div>
</div>
<div class="section" id="description">
<h1>DESCRIPTION</h1>
<p>This page describes major incompatible changes introduced to
Universal-ctags forked from Exuberant-ctags.</p>
</div>
<div class="section" id="incompatibilities-in-command-line-interface">
<h1>Incompatibilities in command line interface</h1>
<div class="section" id="the-order-of-application-of-patterns-and-extensions-in-langmap">
<h2>The order of application of patterns and extensions in <tt class="docutils literal"><span class="pre">--langmap</span></tt></h2>
<p>When applying mappings for a name of given source file,
Exuberant-ctags tests file name patterns AFTER file extensions
(<strong>e-map-order</strong>). Universal-ctags does this differently; it tests file
name patterns BEFORE file extensions (<strong>u-map-order</strong>).</p>
<p>This incompatible change is introduced to deal with the following
situation:</p>
<blockquote>
<ul class="simple">
<li>&quot;build.xml&quot; as a source file,</li>
<li>The &quot;Ant&quot; parser declares it handles a file name pattern &quot;build.xml&quot;, and</li>
<li>The &quot;XML&quot; parser declares it handles a file extension &quot;xml&quot;.</li>
</ul>
</blockquote>
<p>Which parser should be used for parsing &quot;build.xml&quot;?  The assumption
of Universal-ctags is the user may want to use the &quot;Ant&quot; parser; the
file name pattern it declares is more specific than the file extension
that the &quot;XML&quot; parser declares. However, e-map-order chooses the &quot;XML&quot;
parser.</p>
<p>So Universal-ctags uses the u-map-order even though it introduces an
incompatibility.</p>
<p><tt class="docutils literal"><span class="pre">--list-map-extensions=language</span></tt> and <tt class="docutils literal"><span class="pre">--list-map-patterns=language</span></tt>
options are helpful to verify and the file extensions and the file
name patterns of given <em>language</em>.</p>
</div>
<div class="section" id="unexpected-synchronization-between-file-scope-option-and-f-filescope-extra">
<h2>Unexpected synchronization between <tt class="docutils literal"><span class="pre">--file-scope</span></tt> option and &quot;F/fileScope&quot; extra</h2>
<p>Universal-ctags introduces &quot;F/fileScope&quot; extra as the alternative to
<tt class="docutils literal"><span class="pre">--file-scope</span></tt> option.</p>
<p>Providing the two way to control the same thing in Universal-ctags
internal can cause a trouble.</p>
<p>A user, expecting &quot;--file-scope=yes&quot; is enabled by default, gives
&quot;--extras=q&quot;. The intention of the user may be just enabling
&quot;q/qualified&quot;. However, &quot;--extras=q&quot; is evaluated as &quot;disabling all
extras including F/fileScope, then enabling only
q/qualified&quot;. Unexpectedly the command line becomes as if
&quot;--file-scope=no&quot; is set.</p>
<p>In this case the user should set &quot;--extras=+q&quot; instead of &quot;--extras=q&quot;.</p>
</div>
</div>
<div class="section" id="incompatibilities-in-tags-file-format">
<h1>Incompatibilities in tags file format</h1>
</div>
<div class="section" id="option-files-loading-at-starting-up-time-preload-files">
<h1>Option files loading at starting up time (preload files)</h1>
<p>File paths for preload files are changed.
Universal-ctags doesn't load &quot;~/.ctags&quot; at starting up time.
See &quot;FILES&quot; section of ctags(1).</p>
</div>
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